The hair thing has to be a reference to Elisa Lam - it's got so many creepy tie-ins with aspects of this story that it seems almost impossible for it not to be.
I've been wondering if we'd ever see some of the panels with just the blue coloured in and everything else black and white, but I guess it's not viable for a mass market manga. Maybe in an online-specific edition in the future, or something like that . . . .